Paper and Envelope Sizes

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Metric Paper Sizes

Metric paper sizes are also known as International Standard (ISO 216) or DIN (German Standard) paper sizes.
They are used in most of the countries in the world – the most important exception being North America.

In United Kingdom a few ‘inch’ sizes are used alongside metric sizes – see below. However US ‘letter’ and ‘legal’ sizes are never used – they are universally replaced by A4 size.

Every ‘A’ size is double the previous size: A3 is twice the size of A4, and so forth.
Remember that A8 is very small (about 2in x 3in) and A0 is big (nearly 3ft x 4ft).

Metric name Size in mm Size in inches
A0 841 x 1188 33.1/8 x 46.3/4
A1 594 x 841 23.3/8 x 33.1/8
A2 420 x 594 16.1/2 x 23.3/8
A3 297 x 420 11.3/4 x 16.1/2
A4 210 x 297 8.1/4 x 11.3/4
A5 148 x 210 5.7/8 x 8.1/4
A6 105 x 148 4.1/8 x 5.7/8
A7 74 x 105 2.7/8 x 4.1/8
A8 52 x 74 2.1/8 x 2.7/8
1/3A4 (DL) 99 x 210 3.7/8 x 8.1/4
1/4A4 (Qtr.A4) 74 x 210 2.7/8 x 8.1/4

 

For envelope sizes see below

C3 324 x 458 mm 12.8 x 18.0 in

C4 229 x 324 mm 9.0 x 12.8 in

C5 162 x 229 mm 6.4 x 9.0 in

DL 110 x 220 mm 4.4 x 8.8 in

C6 114 x 162 mm 4.5 x 6.4 in

C7 81 x 114 mm 3.2 x 4.5 in

 

To calculate in cm use mm above and move the decimal point one space to the left:
210mm is 21cm.

Imperial Paper Sizes (inches) and Poster Sizes

Inch size Size in mm Paper name
20″ x 30″ 508 x 762 Double Crown
30″ x 40″ 762 x 1016 Quad or Quad Crown
25″ x 40″ 635 x 1016 Double Royal
40″ x 60″ 1016 x 1524 4 Sheet or Double Quad
1200 x 1800 6 Sheet or Six Sheet
3048 x 4064 48 Sheet (too big for a snap frame!)

 

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